Unisex Lightweight Hoodie: The answers are the ancestors

Size (cm)	S	M	L	XL	2XL	3XL
Width	51	54	57	60	63	66
Height	68	70	72	74	76	78

Size (inch)	S	M	L	XL	2XL	3XL
Width	20	21	22.5	23.6	24.8	26
Height	26.7	27.5	28.4	29.1	30	30.7

To get good measurements, lay the shirt (preferably the one you love) on a flat, hard surface, then if there are any creases, smooth them out as much as possible

Width: place the ruler from the bottom of the sleeve and measure the width stopping under the other sleeve.

Height: measure from the highest point of the shoulder (top of the collar) to the bottom of the shirt.